The patch titled
Subject: kernel/umh.c: optimize 'proc_cap_handler()'
has been added to the -mm tree. Its filename is
umh-optimize-proc_cap_handler.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/umh-optimize-proc_cap_handler.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/umh-optimize-proc_cap_handler.patch
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------------------------------------------------------
From: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
Subject: kernel/umh.c: optimize 'proc_cap_handler()'
If 'write' is 0, we can avoid a call to spin_lock/spin_unlock.
Link: http://lkml.kernel.org/r/20171020193331.7233-1-christophe.jaillet@xxxxxxxxxx
Signed-off-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
Acked-by: Luis R. Rodriguez <mcgrof@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/umh.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff -puN kernel/umh.c~umh-optimize-proc_cap_handler kernel/umh.c
--- a/kernel/umh.c~umh-optimize-proc_cap_handler
+++ a/kernel/umh.c
@@ -537,14 +537,14 @@ static int proc_cap_handler(struct ctl_t
/*
* Drop everything not in the new_cap (but don't add things)
*/
- spin_lock(&umh_sysctl_lock);
if (write) {
+ spin_lock(&umh_sysctl_lock);
if (table->data == CAP_BSET)
usermodehelper_bset = cap_intersect(usermodehelper_bset, new_cap);
if (table->data == CAP_PI)
usermodehelper_inheritable = cap_intersect(usermodehelper_inheritable, new_cap);
+ spin_unlock(&umh_sysctl_lock);
}
- spin_unlock(&umh_sysctl_lock);
return 0;
}
_
Patches currently in -mm which might be from christophe.jaillet@xxxxxxxxxx are
umh-optimize-proc_cap_handler.patch
rapidio-fix-resources-leak-in-error-handling-path-in-rio_dma_transfer.patch
rapidio-fix-an-error-handling-in-rio_dma_transfer.patch
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