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2008-07-27KVM: s390: Change guestaddr type in gaccessMartin Schwidefsky
All registers are unsigned long types. This patch changes all occurences of guestaddr in gaccess from u64 to unsigned long. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-07-27KVM: s390: Fix guest kconfigChristian Borntraeger
Cornelia Huck noticed that a modular virtio without kvm guest support leads to a build error in the s390 virtio transport: CONFIG_VIRTIO=m leads to ERROR: "vmem_add_mapping" [drivers/s390/kvm/kvm_virtio.ko] undefined! ERROR: "max_pfn" [drivers/s390/kvm/kvm_virtio.ko] undefined! ERROR: "vmem_remove_mapping" [drivers/s390/kvm/kvm_virtio.ko] undefined! The virtio transport only works with kvm guest support and only as a builtin. Lets change the build process of drivers/s390/kvm/kvm_virtio.c to depend on kvm guest support, which is also a bool. CONFIG_S390_GUEST already selects CONFIG_VIRTIO, that should prevent CONFIG_S390_GUEST=y CONFIG_VIRTIO=n situations. CC: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-07-27KVM: s390: Advertise KVM_CAP_USER_MEMORYCarsten Otte
KVM_CAP_USER_MEMORY is used by s390, therefore, we should advertise it. Signed-off-by: Carsten Otte <cotte@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-07-27KVM: ia64: Fix irq disabling leak in error handling codeJulia Lawall
There is a call to local_irq_restore in the normal exit case, so it would seem that there should be one on an error return as well. The semantic patch that finds this problem is as follows: (http://www.emn.fr/x-info/coccinelle/) // <smpl> @@ expression l; expression E,E1,E2; @@ local_irq_save(l); ... when != local_irq_restore(l) when != spin_unlock_irqrestore(E,l) when any when strict ( if (...) { ... when != local_irq_restore(l) when != spin_unlock_irqrestore(E1,l) + local_irq_restore(l); return ...; } | if (...) + {local_irq_restore(l); return ...; + } | spin_unlock_irqrestore(E2,l); | local_irq_restore(l); ) // </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-07-27KVM: VMX: Fix undefined beaviour of EPT after reload kvm-intel.koSheng Yang
As well as move set base/mask ptes to vmx_init(). Signed-off-by: Sheng Yang <sheng.yang@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-07-27KVM: VMX: Fix bypass_guest_pf enabling when disable EPT in module parameterSheng Yang
Signed-off-by: Sheng Yang <sheng.yang@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-07-27KVM: task switch: translate guest segment limit to virt-extension byte ↵Marcelo Tosatti
granular field If 'g' is one then limit is 4kb granular. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-07-27KVM: Avoid instruction emulation when event delivery is pendingAvi Kivity
When an event (such as an interrupt) is injected, and the stack is shadowed (and therefore write protected), the guest will exit. The current code will see that the stack is shadowed and emulate a few instructions, each time postponing the injection. Eventually the injection may succeed, but at that time the guest may be unwilling to accept the interrupt (for example, the TPR may have changed). This occurs every once in a while during a Windows 2008 boot. Fix by unshadowing the fault address if the fault was due to an event injection. Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-07-27KVM: task switch: use seg regs provided by subarch instead of reading from GDTMarcelo Tosatti
There is no guarantee that the old TSS descriptor in the GDT contains the proper base address. This is the case for Windows installation's reboot-via-triplefault. Use guest registers instead. Also translate the address properly. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-07-27KVM: task switch: segment base is linear addressMarcelo Tosatti
The segment base is always a linear address, so translate before accessing guest memory. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-07-27KVM: SVM: allow enabling/disabling NPT by reloading only the architecture moduleJoerg Roedel
If NPT is enabled after loading both KVM modules on AMD and it should be disabled, both KVM modules must be reloaded. If only the architecture module is reloaded the behavior is undefined. With this patch it is possible to disable NPT only by reloading the kvm_amd module. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-07-27ALSA: Allow to force model to intel-mac-v3 in snd_hda_intel (sigmatel).Nicolas Boichat
Currently, even if you pass model=intel-mac-v3 as a module parameter to snd_hda_intel, the function patch_stac922x (patch_sigmatel.c) will still try to auto-detect the model type. This is a problem on my MacBook Pro 1st generation, which needs intel-mac-v3, but sometimes incorrectly reports 0x00000100 as subsystem id, which causes the switch in patch_stac922x to select intel-mac-v4. To fix this, I added a new model called intel-mac-auto, so in case no module parameter is passed, and an Intel Mac board is detected, the model will be automatically detected, while no detection will be done if the model is forced to intel-mac-v3. This problem has been around for quite a while, and I used to fix it by moving the case statement for 0x00000100 in patch_stac922x so that intel-mac-v3 is chosen. Another way to fix the problem would be to check if a module parameter was set directly in patch_stac922x, using something like this: if (spec->board_config == STAC_INTEL_MAC_V3 && !codec->bus->modelname) { But I think it is less elegant (if you prefer that way, I can prepare a patch). Signed-off-by: Nicolas Boichat <nicolas@boichat.ch> Signed-off-by: Takashi Iwai <tiwai@suse.de>
2008-07-27ALSA: cs4232: fix crash during chip PNP detectionKrzysztof Helt
The acard->wss pointer is uninitialized in this function which leads to crash during chip PNP detection. Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl> Acked-by: Rene Herman <rene.herman@gmail.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
2008-07-27ALSA: hda - Add automatic model setting for the Acer Aspire 5920G laptopTravis Place
Make the Acer Aspire 5920G (1025:0121) select ALC883_ACER_ASPIRE by default. Signed-off-by: Travis Place <wishie@wishie.net> Signed-off-by: Takashi Iwai <tiwai@suse.de>
2008-07-27ALSA: make snd_ac97_add_vmaster() staticAdrian Bunk
This patch makes the needlessly global snd_ac97_add_vmaster() static. Signed-off-by: Adrian Bunk <bunk@kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
2008-07-27ALSA: sound/pci/azt3328.h: no variables for enumsAdrian Bunk
AZF_FREQUENCIES and AZF_GAME_CONFIGS were variables, and this doesn't seem to have been intended. Signed-off-by: Adrian Bunk <bunk@kernel.org> Acked-by: Andreas Mohr <andi@lisas.de> Signed-off-by: Takashi Iwai <tiwai@suse.de>
2008-07-26Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband: mlx4: Update/add Mellanox Technologies copyright lines to mlx4 driver files mlx4_core: Add VLAN tag field to WQE control segment struct RDMA/nes: CM connection setup/teardown rework IPoIB: Correct help text for INFINIBAND_IPOIB_DEBUG IPoIB/cm: Connected mode is no longer EXPERIMENTAL RDMA/ucm: BKL is not needed for ib_ucm_open() RDMA/ucma: BKL is not needed for ucma_open()
2008-07-26fix for a memory leak in an error case introduced by fix for double freeOliver Neukum
The fix NULLed a pointer without freeing it. Signed-off-by: Oliver Neukum <oneukum@suse.de> Reported-by: Juha Motorsportcom <juha_motorsportcom@luukku.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-07-26Merge git://git.infradead.org/mtd-2.6Linus Torvalds
* git://git.infradead.org/mtd-2.6: (57 commits) [MTD] [NAND] subpage read feature as a way to increase performance. CPUFREQ: S3C24XX NAND driver frequency scaling support. [MTD][NAND] au1550nd: remove unused variable [MTD] jedec_probe: Fix SST 16-bit chip detection [MTD][MTDPART] Fix a division by zero bug [MTD][MTDPART] Cleanup and document the erase region handling [MTD][MTDPART] Handle most checkpatch findings [MTD][MTDPART] Seperate main loop from per-partition code in add_mtd_partition [MTD] physmap: resume already suspended chips on failure to suspend [MTD] physmap: Fix suspend/resume/shutdown bugs. [MTD] [NOR] Fix -ETIMEO errors in CFI driver [MTD] [NAND] fsl_elbc_nand: fix section mismatch with CONFIG_MTD_OF_PARTS=y [JFFS2] Use .unlocked_ioctl [MTD] Fix const assignment in the MTD command line partitioning driver [MTD] [NOR] gen_probe: No debug message when debugging is disabled [MTD] [NAND] remove __PPC__ hardcoded address from DiskOnChip drivers [MTD] [MAPS] Remove the bast-flash driver. [MTD] [NAND] fsl_elbc_nand: ecclayout cleanups [MTD] [NAND] fsl_elbc_nand: implement support for flash-based BBT [MTD] [NAND] fsl_elbc_nand: fix OOB workability for large page NAND chips ...
2008-07-26Merge branch 'tracehook' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/frob/linux-2.6-utrace * 'tracehook' of git://git.kernel.org/pub/scm/linux/kernel/git/frob/linux-2.6-utrace: tracehook: comment fixes
2008-07-26m68k: gs: use tty_port fixesGeert Uytterhoeven
commit b5391e29f428d11755ca2c91074c6db6f5c69d7c ("gs: use tty_port") forgot to update the m68k gs serial drivers. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-07-26Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/drzeus/mmc * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/drzeus/mmc: atmel-mci: debugfs support mmc: Add per-card debugfs support mmc: Export internal host state through debugfs imxmmc: fix crash when no platform data is provided imxmmc: fix platform resources imxmmc: remove DEBUG definition mmc_spi: put signals to low power off fix
2008-07-26Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6: (39 commits) [PATCH] fix RLIM_NOFILE handling [PATCH] get rid of corner case in dup3() entirely [PATCH] remove remaining namei_{32,64}.h crap [PATCH] get rid of indirect users of namei.h [PATCH] get rid of __user_path_lookup_open [PATCH] f_count may wrap around [PATCH] dup3 fix [PATCH] don't pass nameidata to __ncp_lookup_validate() [PATCH] don't pass nameidata to gfs2_lookupi() [PATCH] new (local) helper: user_path_parent() [PATCH] sanitize __user_walk_fd() et.al. [PATCH] preparation to __user_walk_fd cleanup [PATCH] kill nameidata passing to permission(), rename to inode_permission() [PATCH] take noexec checks to very few callers that care Re: [PATCH 3/6] vfs: open_exec cleanup [patch 4/4] vfs: immutable inode checking cleanup [patch 3/4] fat: dont call notify_change [patch 2/4] vfs: utimes cleanup [patch 1/4] vfs: utimes: move owner check into inode_change_ok() [PATCH] vfs: use kstrdup() and check failing allocation ...
2008-07-26Merge git://git.kernel.org/pub/scm/linux/kernel/git/kkeil/ISDN-2.6Linus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/kkeil/ISDN-2.6: Add layer1 over IP support Add mISDN HFC multiport driver Add mISDN HFC PCI driver Add mISDN DSP Add mISDN core files Define AF_ISDN and PF_ISDN Add mISDN driver
2008-07-26Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6Linus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6: netns: fix ip_rt_frag_needed rt_is_expired netfilter: nf_conntrack_extend: avoid unnecessary "ct->ext" dereferences netfilter: fix double-free and use-after free netfilter: arptables in netns for real netfilter: ip{,6}tables_security: fix future section mismatch selinux: use nf_register_hooks() netfilter: ebtables: use nf_register_hooks() Revert "pkt_sched: sch_sfq: dump a real number of flows" qeth: use dev->ml_priv instead of dev->priv syncookies: Make sure ECN is disabled net: drop unused BUG_TRAP() net: convert BUG_TRAP to generic WARN_ON drivers/net: convert BUG_TRAP to generic WARN_ON
2008-07-26firmware: fix memmap printk format warningsRandy Dunlap
Fix firmware/memmap printk format warnings: drivers/firmware/memmap.c:156: warning: format '%llx' expects type 'long long unsigned int', but argument 4 has type 'resource_size_t' drivers/firmware/memmap.c:161: warning: format '%llx' expects type 'long long unsigned int', but argument 4 has type 'resource_size_t' Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Cc: Bernhard Walle <bwalle@suse.de> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-07-26mm/util.c must #include <linux/sched.h>Adrian Bunk
mm/util.c: In function 'arch_pick_mmap_layout': mm/util.c:144: error: dereferencing pointer to incomplete type mm/util.c:145: error: 'arch_get_unmapped_area' undeclared (first use in this function) mm/util.c:145: error: (Each undeclared identifier is reported only once mm/util.c:145: error: for each function it appears in.) mm/util.c:146: error: 'arch_unmap_area' undeclared (first use in this function) Signed-off-by: Adrian Bunk <bunk@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-07-26hugetlb: remove unused variable warningAndrea Righi
Remove the following warning when CONFIG_HUGETLB_PAGE is not set: ipc/shm.c: In function `shm_get_stat': ipc/shm.c:565: warning: unused variable `h' [akpm@linux-foundation.org: use tabs, not spaces] Signed-off-by: Andrea Righi <righi.andrea@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-07-26task IO accounting: correctly account threads IO statisticsAndrea Righi
Oleg Nesterov points out that we should check that the task is still alive before we iterate over the threads. This patch includes a fixup for this. Also simplify do_io_accounting() implementation. Signed-off-by: Andrea Righi <righi.andrea@gmail.com> Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-07-26gpiolib: fix typo in commentMichael Buesch
This fixes an off-by-one error in a comment. Signed-off-by: Michael Buesch <mb@bu3sch.de> Cc: David Brownell <david-b@pacbell.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-07-26[PATCH] fix RLIM_NOFILE handlingAl Viro
* dup2() should return -EBADF on exceeded sysctl_nr_open * dup() should *not* return -EINVAL even if you have rlimit set to 0; it should get -EMFILE instead. Check for orig_start exceeding rlimit taken to sys_fcntl(). Failing expand_files() in dup{2,3}() now gets -EMFILE remapped to -EBADF. Consequently, remaining checks for rlimit are taken to expand_files(). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2008-07-26[PATCH] get rid of corner case in dup3() entirelyAl Viro
Since Ulrich is OK with getting rid of dup3(fd, fd, flags) completely, to hell the damn thing goes. Corner case for dup2() is handled in sys_dup2() (complete with -EBADF if dup2(fd, fd) is called with fd that is not open), the rest is done in dup3(). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2008-07-26[PATCH] remove remaining namei_{32,64}.h crapAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2008-07-26[PATCH] get rid of indirect users of namei.hAl Viro
fs.h needs path.h, not namei.h; nfs_fs.h doesn't need it at all. Several places in the tree needed direct include. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2008-07-26[PATCH] get rid of __user_path_lookup_openAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2008-07-26[PATCH] f_count may wrap aroundAl Viro
make it atomic_long_t; while we are at it, get rid of useless checks in affs, hfs and hpfs - ->open() always has it equal to 1, ->release() - to 0. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2008-07-26[PATCH] dup3 fixUlrich Drepper
Al Viro notice one cornercase that the new dup3() code. The dup2() function, as a special case, handles dup-ing to the same file descriptor. In this case the current dup3() code does nothing at all. I.e., it ingnores the flags parameter. This shouldn't happen, the close-on-exec flag should be set if requested. In case the O_CLOEXEC bit in the flags parameter is not set the dup3() function should behave in this respect identical to dup2(). This means dup3(fd, fd, 0) should not actively reset the c-o-e flag. The patch below implements this minor change. [AV: credits to Artur Grabowski for bringing that up as potential subtle point in dup2() behaviour] Signed-off-by: Ulrich Drepper <drepper@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2008-07-26[PATCH] don't pass nameidata to __ncp_lookup_validate()Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2008-07-26[PATCH] don't pass nameidata to gfs2_lookupi()Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2008-07-26[PATCH] new (local) helper: user_path_parent()Al Viro
Preparation to untangling intents mess: reduce the number of do_path_lookup() callers. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2008-07-26[PATCH] sanitize __user_walk_fd() et.al.Al Viro
* do not pass nameidata; struct path is all the callers want. * switch to new helpers: user_path_at(dfd, pathname, flags, &path) user_path(pathname, &path) user_lpath(pathname, &path) user_path_dir(pathname, &path) (fail if not a directory) The last 3 are trivial macro wrappers for the first one. * remove nameidata in callers. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2008-07-26[PATCH] preparation to __user_walk_fd cleanupAl Viro
Almost all users __user_walk_fd() and friends care only about struct path. Get rid of the few that do not. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2008-07-26[PATCH] kill nameidata passing to permission(), rename to inode_permission()Al Viro
Incidentally, the name that gives hundreds of false positives on grep is not a good idea... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2008-07-26[PATCH] take noexec checks to very few callers that careAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2008-07-26Re: [PATCH 3/6] vfs: open_exec cleanupChristoph Hellwig
On Mon, May 19, 2008 at 12:01:49AM +0200, Marcin Slusarz wrote: > open_exec is needlessly indented, calls ERR_PTR with 0 argument > (which is not valid errno) and jumps into middle of function > just to return value. > So clean it up a bit. Still looks rather messy. See below for a better version. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2008-07-26[patch 4/4] vfs: immutable inode checking cleanupMiklos Szeredi
Move the immutable and append-only checks from chmod, chown and utimes into notify_change(). Checks for immutable and append-only files are always performed by the VFS and not by the filesystem (see permission() and may_...() in namei.c), so these belong in notify_change(), and not in inode_change_ok(). This should be completely equivalent. CC: Ulrich Drepper <drepper@redhat.com> CC: Michael Kerrisk <mtk.manpages@gmail.com> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2008-07-26[patch 3/4] fat: dont call notify_changeMiklos Szeredi
The FAT_IOCTL_SET_ATTRIBUTES ioctl() calls notify_change() to change the file mode before changing the inode attributes. Replace with explicit calls to security_inode_setattr(), fat_setattr() and fsnotify_change(). This is equivalent to the original. The reason it is needed, is that later in the series we move the immutable check into notify_change(). That would break the FAT_IOCTL_SET_ATTRIBUTES ioctl, as it needs to perform the mode change regardless of the immutability of the file. [Fix error if fat is built as a module. Thanks to OGAWA Hirofumi for noticing.] Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Acked-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2008-07-26[patch 2/4] vfs: utimes cleanupMiklos Szeredi
Untange the mess that is do_utimes(). Add kerneldoc comment to do_utimes(). CC: Ulrich Drepper <drepper@redhat.com> CC: Michael Kerrisk <mtk.manpages@gmail.com> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2008-07-26[patch 1/4] vfs: utimes: move owner check into inode_change_ok()Miklos Szeredi
Add a new ia_valid flag: ATTR_TIMES_SET, to handle the UTIMES_OMIT/UTIMES_NOW and UTIMES_NOW/UTIMES_OMIT cases. In these cases neither ATTR_MTIME_SET nor ATTR_ATIME_SET is in the flags, yet the POSIX draft specifies that permission checking is performed the same way as if one or both of the times was explicitly set to a timestamp. See the path "vfs: utimensat(): fix error checking for {UTIME_NOW,UTIME_OMIT} case" by Michael Kerrisk for the patch introducing this behavior. This is a cleanup, as well as allowing filesystems (NFS/fuse/...) to perform their own permission checking instead of the default. CC: Ulrich Drepper <drepper@redhat.com> CC: Michael Kerrisk <mtk.manpages@gmail.com> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2008-07-26[PATCH] vfs: use kstrdup() and check failing allocationLi Zefan
- use kstrdup() instead of kmalloc() + memcpy() - return NULL if allocating ->mnt_devname failed - mnt_devname should be const Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Acked-by: Cyrill Gorcunov <gorcunov@gmail.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>