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Groups > linux.kernel > #1727802
| From | Miguel Bernal Marin <miguel.bernal.marin@linux.intel.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH v2 0/3] locking/rwsem/x86: Add stack frame dependency for some inline asm |
| Date | 2017-09-07 00:50 +0200 |
| Message-ID | <umRiV-85i-1@gated-at.bofh.it> (permalink) |
| References | <umB4t-5b7-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
Some warning were showed by objtool using gcc 7.2.0 kernel/locking/rwsem.o: warning: objtool: up_read()+0x11: call without frame pointer save/setup kernel/locking/rwsem.o: warning: objtool: up_write()+0x17: call without frame pointer save/setup kernel/locking/rwsem.o: warning: objtool: downgrade_write()+0x22: call without frame pointer save/setup which means gcc placed an inline asm function and its call instruction before the frame pointer setup. This series forces a stack frame to be created before the call instruction by listing the stack pointer as an output operand in the inline asm statement. Changes in v2: - Update first parameter from _ASM_ADD to '%3' at __downgrade_write() Miguel Bernal Marin (3): locking/rwsem/x86: Add stack frame dependency for __up_read() locking/rwsem/x86: Add stack frame dependency for __up_write() locking/rwsem/x86: Add stack frame dependency for __downgrade_write() arch/x86/include/asm/rwsem.h | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-) -- 2.14.1
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[PATCH 0/3] locking/rwsem/x86: Add stack frame dependency for some inline asm Miguel Bernal Marin <miguel.bernal.marin@linux.intel.com> - 2017-09-06 07:30 +0200
[PATCH v2 0/3] locking/rwsem/x86: Add stack frame dependency for some inline asm Miguel Bernal Marin <miguel.bernal.marin@linux.intel.com> - 2017-09-07 00:50 +0200
[PATCH v2 1/3] locking/rwsem/x86: Add stack frame dependency for __up_read() Miguel Bernal Marin <miguel.bernal.marin@linux.intel.com> - 2017-09-07 00:50 +0200
Re: [PATCH v2 1/3] locking/rwsem/x86: Add stack frame dependency for __up_read() Ingo Molnar <mingo@kernel.org> - 2017-09-07 09:20 +0200
[PATCH v2 3/3] locking/rwsem/x86: Add stack frame dependency for __downgrade_write() Miguel Bernal Marin <miguel.bernal.marin@linux.intel.com> - 2017-09-07 00:50 +0200
[PATCH v2 2/3] locking/rwsem/x86: Add stack frame dependency for __up_write() Miguel Bernal Marin <miguel.bernal.marin@linux.intel.com> - 2017-09-07 00:50 +0200
Re: [PATCH v2 0/3] locking/rwsem/x86: Add stack frame dependency for some inline asm Josh Poimboeuf <jpoimboe@redhat.com> - 2017-09-07 01:10 +0200
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