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author | Ingo Molnar <mingo@elte.hu> | 2008-07-22 09:06:21 +0200 |
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committer | Ingo Molnar <mingo@elte.hu> | 2008-07-22 09:06:21 +0200 |
commit | 76c3bb15d6786a0b8da0ad0090e0c9c3672fc08b (patch) | |
tree | 3824e008db9d554229a70c85fbbc13238276bd7a /arch/mips/kernel/syscall.c | |
parent | 7be42004065ce4df193aeef5befd26805267d0d9 (diff) | |
parent | 93ded9b8fd42abe2c3607097963d8de6ad9117eb (diff) |
Merge branch 'linus' into x86/x2apic
Diffstat (limited to 'arch/mips/kernel/syscall.c')
-rw-r--r-- | arch/mips/kernel/syscall.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/arch/mips/kernel/syscall.c b/arch/mips/kernel/syscall.c index af1bdc89748..3523c8d12ed 100644 --- a/arch/mips/kernel/syscall.c +++ b/arch/mips/kernel/syscall.c @@ -40,7 +40,14 @@ #include <asm/sysmips.h> #include <asm/uaccess.h> -asmlinkage int sys_pipe(nabi_no_regargs volatile struct pt_regs regs) +/* + * For historic reasons the pipe(2) syscall on MIPS has an unusual calling + * convention. It returns results in registers $v0 / $v1 which means there + * is no need for it to do verify the validity of a userspace pointer + * argument. Historically that used to be expensive in Linux. These days + * the performance advantage is negligible. + */ +asmlinkage int sysm_pipe(nabi_no_regargs volatile struct pt_regs regs) { int fd[2]; int error, res; |