From: Jens Axboe <axboe@kernel.dk>
To: Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] arm64: treat PF_IO_WORKER like PF_KTHREAD for mitigations
Date: Wed, 25 Jan 2023 09:43:34 -0700 [thread overview]
Message-ID: <dfc03be2-e246-ed23-6efb-fbd54a8e7781@kernel.dk> (raw)
Like PF_KTHREAD, PF_IO_WORKER never exit to userspace. They exist
entirely within the kernel, and hence don't need any task mitigations
applied.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
diff --git a/arch/arm64/kernel/proton-pack.c b/arch/arm64/kernel/proton-pack.c
index fca9cc6f5581..25a21c3d446c 100644
--- a/arch/arm64/kernel/proton-pack.c
+++ b/arch/arm64/kernel/proton-pack.c
@@ -654,7 +654,7 @@ static void __update_pstate_ssbs(struct pt_regs *regs, bool state)
void spectre_v4_enable_task_mitigation(struct task_struct *tsk)
{
struct pt_regs *regs = task_pt_regs(tsk);
- bool ssbs = false, kthread = tsk->flags & PF_KTHREAD;
+ bool ssbs = false, kthread = tsk->flags & (PF_KTHREAD | PF_IO_WORKER);
if (spectre_v4_mitigations_off())
ssbs = true;
--
Jens Axboe
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next reply other threads:[~2023-01-25 16:46 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-25 16:43 Jens Axboe [this message]
2023-01-26 14:00 ` [PATCH] arm64: treat PF_IO_WORKER like PF_KTHREAD for mitigations Will Deacon
2023-01-26 14:07 ` Jens Axboe
2023-01-26 15:04 ` Catalin Marinas
2023-03-28 14:14 ` Will Deacon
2023-03-28 16:47 ` Jens Axboe
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=dfc03be2-e246-ed23-6efb-fbd54a8e7781@kernel.dk \
--to=axboe@kernel.dk \
--cc=catalin.marinas@arm.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=will@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).