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authorDenys Vlasenko <dvlasenk@redhat.com>2015-03-19 18:17:45 +0100
committerIngo Molnar <mingo@kernel.org>2015-03-24 19:42:37 +0100
commitb3fe8ba320ace38cee6859b4c015d81627254ddb (patch)
tree5d831988166280490c4593f4505dacfca46e54c4 /firmware/keyspan_pda
parenta76c7f4604937bc781bfc411ef92c59474ddadda (diff)
x86/asm/entry/64: Change the THREAD_INFO() definition to not depend on KERNEL_STACK_OFFSET
This changes the THREAD_INFO() definition and all its callsites so that they do not count stack position from (top of stack - KERNEL_STACK_OFFSET), but from top of stack. Semi-mysterious expressions THREAD_INFO(%rsp,RIP) - "why RIP??" are now replaced by more logical THREAD_INFO(%rsp,SIZEOF_PTREGS) - "calculate thread_info's address using information that rsp is SIZEOF_PTREGS bytes below top of stack". While at it, replace "(off)-THREAD_SIZE(reg)" with equivalent "((off)-THREAD_SIZE)(reg)". The form without parentheses falsely looks like we invoke THREAD_SIZE() macro. Improve comment atop THREAD_INFO macro definition. This patch does not change generated code (verified by objdump). Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com> Acked-by: Borislav Petkov <bp@suse.de> Acked-by: Andy Lutomirski <luto@kernel.org> Cc: Alexei Starovoitov <ast@plumgrid.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Kees Cook <keescook@chromium.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Will Drewry <wad@chromium.org> Link: http://lkml.kernel.org/r/1426785469-15125-1-git-send-email-dvlasenk@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'firmware/keyspan_pda')
0 files changed, 0 insertions, 0 deletions