From: Pavel Machek <pavel@ucw.cz>
To: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Ingo Molnar <mingo@kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Steven Rostedt <rostedt@goodmis.org>,
Borislav Petkov <bp@alien8.de>, "H. Peter Anvin" <hpa@zytor.com>,
Andy Lutomirski <luto@amacapital.net>,
Oleg Nesterov <oleg@redhat.com>,
Frederic Weisbecker <fweisbec@gmail.com>,
Alexei Starovoitov <ast@plumgrid.com>,
Will Drewry <wad@chromium.org>, Kees Cook <keescook@chromium.org>,
x86@kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/3] x86, acpi: Eliminate saved_eip
Date: Tue, 16 Jun 2015 12:05:46 +0200 [thread overview]
Message-ID: <20150616100546.GA22928@amd> (raw)
In-Reply-To: <1434288190-24993-1-git-send-email-dvlasenk@redhat.com>
> diff --git a/arch/x86/kernel/acpi/wakeup_32.S b/arch/x86/kernel/acpi/wakeup_32.S
> index 665c6b7..eef2bd3 100644
> --- a/arch/x86/kernel/acpi/wakeup_32.S
> +++ b/arch/x86/kernel/acpi/wakeup_32.S
> @@ -31,17 +31,11 @@ wakeup_pmode_return:
>
> movl %cs:saved_magic, %eax
> cmpl $0x12345678, %eax
> - jne bogus_magic
> -
> - # jump to place where we left off
> - movl saved_eip, %eax
> - jmp *%eax
> -
> + je ret_point
> bogus_magic:
Longjump is supposed to flush the prefetch, but hopefully nothing
depends on that detail... ...
no.
https://en.wikibooks.org/wiki/X86_Assembly/Protected_Mode#Entering_Protected_Mode
longjump is supposed to be there. Sorry about that. I guess indirect
jump is not neccessary, and we should add a comment there.
Thanks,
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
next prev parent reply other threads:[~2015-06-16 10:05 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-14 13:23 [PATCH 1/3] x86, acpi: Eliminate saved_eip Denys Vlasenko
2015-06-14 13:23 ` [PATCH 2/3] x86, acpi: On S3 failure, just fall through Denys Vlasenko
2015-06-15 10:35 ` Borislav Petkov
2015-06-14 13:23 ` [PATCH 3/3] x86, acpi: Fold {save,restore}_registers into their single callers Denys Vlasenko
2015-06-15 8:58 ` [PATCH 1/3] x86, acpi: Eliminate saved_eip Borislav Petkov
2015-06-16 10:05 ` Pavel Machek [this message]
2015-06-16 12:46 ` Denys Vlasenko
2015-06-17 9:28 ` Pavel Machek
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