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author | Ingo Molnar <mingo@elte.hu> | 2008-07-21 11:02:45 +0200 |
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committer | Ingo Molnar <mingo@elte.hu> | 2008-07-21 11:02:45 +0200 |
commit | e27772b48df91a954a74b1411b57d83b945a58c7 (patch) | |
tree | ebd4a434d9e3cbd0844109e4469f91daac581b59 /arch/mips/kernel/syscall.c | |
parent | d092633bff3b19faffc480fe9810805e7792a029 (diff) | |
parent | 14b395e35d1afdd8019d11b92e28041fad591b71 (diff) |
Merge branch 'linus' into x86/urgent
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; |