lkml.org 
[lkml]   [2017]   [Oct]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 2/4] x86/alternatives: Don't need text_mutex when text_poke() on UP
Oops, this is very wrong. Please ignore this patchset.  Sorry for the noise...

Thanks!

On 2017/10/28 20:50, Zhou Chengming wrote:
> The alternatives_smp_lock/unlock only be used on UP, so we don't
> need to hold the text_mutex when text_poke(). Then in the next patch,
> we can remove the outside smp_alt mutex too.
>
> Signed-off-by: Zhou Chengming<zhouchengming1@huawei.com>
> ---
> arch/x86/kernel/alternative.c | 4 ----
> 1 file changed, 4 deletions(-)
>
> diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c
> index 8549269..5c3f593 100644
> --- a/arch/x86/kernel/alternative.c
> +++ b/arch/x86/kernel/alternative.c
> @@ -442,7 +442,6 @@ static void alternatives_smp_lock(const s32 *start, const s32 *end,
> {
> const s32 *poff;
>
> - mutex_lock(&text_mutex);
> for (poff = start; poff< end; poff++) {
> u8 *ptr = (u8 *)poff + *poff;
>
> @@ -452,7 +451,6 @@ static void alternatives_smp_lock(const s32 *start, const s32 *end,
> if (*ptr == 0x3e)
> text_poke(ptr, ((unsigned char []){0xf0}), 1);
> }
> - mutex_unlock(&text_mutex);
> }
>
> static void alternatives_smp_unlock(const s32 *start, const s32 *end,
> @@ -460,7 +458,6 @@ static void alternatives_smp_unlock(const s32 *start, const s32 *end,
> {
> const s32 *poff;
>
> - mutex_lock(&text_mutex);
> for (poff = start; poff< end; poff++) {
> u8 *ptr = (u8 *)poff + *poff;
>
> @@ -470,7 +467,6 @@ static void alternatives_smp_unlock(const s32 *start, const s32 *end,
> if (*ptr == 0xf0)
> text_poke(ptr, ((unsigned char []){0x3E}), 1);
> }
> - mutex_unlock(&text_mutex);
> }
>
> struct smp_alt_module {


\
 
 \ /
  Last update: 2017-10-29 02:21    [W:0.043 / U:1.052 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site