From: Linus Torvalds <torvalds@linux-foundation.org>
To: Borislav Petkov <bp@alien8.de>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
"the arch/x86 maintainers" <x86@kernel.org>,
Masami Hiramatsu <mhiramat@kernel.org>,
Adrian Hunter <adrian.hunter@intel.com>,
Ian Rogers <irogers@google.com>
Subject: Re: [GIT pull] x86/urgent for v5.15-rc3
Date: Sun, 26 Sep 2021 12:10:50 -0700 [thread overview]
Message-ID: <CAHk-=whJvs+-kCMynbt9YRVfcyM5TL8wwNhdOX9iygC5y--CHw@mail.gmail.com> (raw)
In-Reply-To: <YVC4zz1vCskBMb6I@zn.tnic>
On Sun, Sep 26, 2021 at 11:15 AM Borislav Petkov <bp@alien8.de> wrote:
>
> There's this other rather "theoretical" thing of Intel PT
> decoding being done on any arch but get_unaligned() from
> include/asm-generic/unaligned.h looks as generic and as arch-agnostic as
> they get, to me...
It does now. It used to be a mess where every architecture did their
own thing, including nothing (x86) or lots of inline asm (several).
Arnd cleaned it all up fairly recently.
It turns out doing nothing is wrong - not because of architecture
issues, but because of compiler issues - and doing inline asms is
counter-productive because the compilers will handle the unaligned
case for us.
So every architecture uses that <asm-generic/unaligned.h> and is happy about it.
A couple of architectures still have their own <asm/unaligned.h>, but
that's just because they have some additional stuff for legacy reasons
there. They still use the generic header for the actual unaligned
handling.
Linus
next prev parent reply other threads:[~2021-09-26 19:11 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-26 10:30 [GIT pull] irq/urgent for v5.15-rc3 Thomas Gleixner
2021-09-26 10:30 ` [GIT pull] timers/urgent " Thomas Gleixner
2021-09-26 17:27 ` pr-tracker-bot
2021-09-26 10:30 ` [GIT pull] x86/urgent " Thomas Gleixner
2021-09-26 17:21 ` Linus Torvalds
2021-09-26 18:15 ` Borislav Petkov
2021-09-26 19:10 ` Linus Torvalds [this message]
2021-09-28 17:56 ` Borislav Petkov
2021-09-28 20:13 ` Linus Torvalds
2021-09-28 20:41 ` Borislav Petkov
2021-09-28 22:44 ` Linus Torvalds
2021-09-29 18:10 ` [PATCH] x86/insn: Use get_unaligned() instead of memcpy() Borislav Petkov
2021-09-30 0:00 ` Masami Hiramatsu
2021-10-04 9:48 ` [tip: x86/misc] " tip-bot2 for Borislav Petkov
2021-10-06 10:02 ` tip-bot2 for Borislav Petkov
2021-09-26 17:27 ` [GIT pull] x86/urgent for v5.15-rc3 pr-tracker-bot
2021-09-26 17:27 ` [GIT pull] irq/urgent " pr-tracker-bot
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