Paul Mackerras writes:
> On Wed, Oct 25, 2017 at 07:39:48AM +, Matthew Wilcox wrote:
>> Hang on, don't tell me you found this by inspection. Are you not
>> running the bitmap testcase, enabled by CONFIG_TEST_BITMAP? Either
>> that should be producing an error, or there's a missing test case,
From: Paul Mackerras [mailto:pau...@ozlabs.org]
> On Wed, Oct 25, 2017 at 07:39:48AM +, Matthew Wilcox wrote:
> > Hang on, don't tell me you found this by inspection. Are you not running
> > the
> bitmap testcase, enabled by CONFIG_TEST_BITMAP? Either that should be
> producing an error, or
: Paul Mackerras [mailto:pau...@ozlabs.org]
> Sent: Wednesday, October 25, 2017 2:57 AM
> To: Matthew Wilcox ; Linus Torvalds
> ; l...@vger.kernel.org
> Cc: linuxppc-...@ozlabs.org; linux-s...@vger.kernel.org
> Subject: [PATCH] bitmap: Fix optimization of bitmap_set/clear for big-endian
>
On Wed, Oct 25, 2017 at 07:39:48AM +, Matthew Wilcox wrote:
> Hang on, don't tell me you found this by inspection. Are you not running the
> bitmap testcase, enabled by CONFIG_TEST_BITMAP? Either that should be
> producing an error, or there's a missing test case, or your inspection is
> w
Commit 2a98dc028f91 ("include/linux/bitmap.h: turn bitmap_set and
bitmap_clear into memset when possible", 2017-07-10) added an
optimization which effectively assumes that a contiguous set of
bits in a bitmap will be stored in a contiguous set of bytes of
the bitmap, in the case where the starting
