Bug 6205 - _syscallX() macros on ARM forget to mark "memory" as clobbered
Summary: _syscallX() macros on ARM forget to mark "memory" as clobbered
Status: REJECTED INVALID
Alias: None
Product: Platform Specific/Hardware
Classification: Unclassified
Component: ARM (show other bugs)
Hardware: i386 Linux
: P2 normal
Assignee: Russell King
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2006-03-09 15:15 UTC by Markus Gutschke
Modified: 2006-04-26 18:27 UTC (History)
0 users

See Also:
Kernel Version: 2.6.15.6
Tree: Mainline
Regression: ---


Attachments
This patch adds the missing "memory" constraints (1.54 KB, patch)
2006-03-09 15:16 UTC, Markus Gutschke
Details | Diff

Description Markus Gutschke 2006-03-09 15:15:08 UTC
Most recent kernel where this bug did not occur: n/a
Distribution: n/a
Hardware Environment: n/a
Software Environment: n/a
Problem Description: In order to prevent gcc from making incorrect
optimizations, all asm() statements that define system calls should report
memory as clobbered. Recent versions of the headers for i386 have been changed
accordingly, but the ARM headers are still defective.

Steps to reproduce:

Use the _syscallX() macros and notice how every once in a while gcc tries to
cache modified memory values across system calls.
Comment 1 Markus Gutschke 2006-03-09 15:16:13 UTC
Created attachment 7553 [details]
This patch adds the missing "memory" constraints
Comment 2 Russell King 2006-04-26 13:14:58 UTC
Doesn't apply to current kernels.  In any case, please submit it via the ARM Linux
patch system (see www.arm.linux.org.uk)
Comment 3 Markus Gutschke 2006-04-26 18:27:44 UTC
Submitted an updated patch that is now tracked at:
http://www.arm.linux.org.uk/developer/patches/viewpatch.php?id=3486/1

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