linux-kernel - Re: [PATCH] powerpc/signal32: Force inlining of __unsafe_save_user_regs() and save_tm_user_regs

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Message-Id: <168836201884.50010.14478880824891760898.b4-ty@ellerman.id.au>
Date:   Mon, 03 Jul 2023 15:26:58 +1000
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH] powerpc/signal32: Force inlining of __unsafe_save_user_regs() and save_tm_user_regs_unsafe()

On Mon, 05 Jun 2023 10:58:35 +0200, Christophe Leroy wrote:
> Looking at generated code for handle_signal32() shows calls to a
> function called __unsafe_save_user_regs.constprop.0 while user access
> is open.
> 
> And that __unsafe_save_user_regs.constprop.0 function has two nops at
> the begining, allowing it to be traced, which is unexpected during
> user access open window.
> 
> [...]

Applied to powerpc/next.

[1/1] powerpc/signal32: Force inlining of __unsafe_save_user_regs() and save_tm_user_regs_unsafe()
      https://git.kernel.org/powerpc/c/a03b1a0b19398a47489fdcef02ec19c2ba05a15d

cheers