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[PATCH] use smp_mb/wmb/rmb where possible

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Replace a number of memory barriers with smp_ variants.  This means we won't
take the unnecessary hit on UP machines.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
akpm@osdl.org
2005-05-01 08:58:47 -07:00
committed by Linus Torvalds
parent 0d8d4d42f2
commit d59dd4620f
11 changed files with 31 additions and 31 deletions
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20
kernel/sys.c
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@@ -525,7 +525,7 @@ asmlinkage long sys_setregid(gid_t rgid, gid_t egid)
if (new_egid != old_egid)
{
current->mm->dumpable = 0;
wmb();
smp_wmb();
}
if (rgid != (gid_t) -1 ||
(egid != (gid_t) -1 && egid != old_rgid))
@@ -556,7 +556,7 @@ asmlinkage long sys_setgid(gid_t gid)
if(old_egid != gid)
{
current->mm->dumpable=0;
wmb();
smp_wmb();
}
current->gid = current->egid = current->sgid = current->fsgid = gid;
}
@@ -565,7 +565,7 @@ asmlinkage long sys_setgid(gid_t gid)
if(old_egid != gid)
{
current->mm->dumpable=0;
wmb();
smp_wmb();
}
current->egid = current->fsgid = gid;
}
@@ -596,7 +596,7 @@ static int set_user(uid_t new_ruid, int dumpclear)
if(dumpclear)
{
current->mm->dumpable = 0;
wmb();
smp_wmb();
}
current->uid = new_ruid;
return 0;
@@ -653,7 +653,7 @@ asmlinkage long sys_setreuid(uid_t ruid, uid_t euid)
if (new_euid != old_euid)
{
current->mm->dumpable=0;
wmb();
smp_wmb();
}
current->fsuid = current->euid = new_euid;
if (ruid != (uid_t) -1 ||
@@ -703,7 +703,7 @@ asmlinkage long sys_setuid(uid_t uid)
if (old_euid != uid)
{
current->mm->dumpable = 0;
wmb();
smp_wmb();
}
current->fsuid = current->euid = uid;
current->suid = new_suid;
@@ -748,7 +748,7 @@ asmlinkage long sys_setresuid(uid_t ruid, uid_t euid, uid_t suid)
if (euid != current->euid)
{
current->mm->dumpable = 0;
wmb();
smp_wmb();
}
current->euid = euid;
}
@@ -798,7 +798,7 @@ asmlinkage long sys_setresgid(gid_t rgid, gid_t egid, gid_t sgid)
if (egid != current->egid)
{
current->mm->dumpable = 0;
wmb();
smp_wmb();
}
current->egid = egid;
}
@@ -845,7 +845,7 @@ asmlinkage long sys_setfsuid(uid_t uid)
if (uid != old_fsuid)
{
current->mm->dumpable = 0;
wmb();
smp_wmb();
}
current->fsuid = uid;
}
@@ -875,7 +875,7 @@ asmlinkage long sys_setfsgid(gid_t gid)
if (gid != old_fsgid)
{
current->mm->dumpable = 0;
wmb();
smp_wmb();
}
current->fsgid = gid;
key_fsgid_changed(current);