linux-kernel - Re: [PATCH 1/2] arm64: uprobe: Return EOPNOTSUPP for AARCH32 instruction probing

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Message-Id: <161407668452.1401335.3864455032595350603.b4-ty@kernel.org>
Date:   Tue, 23 Feb 2021 15:28:39 +0000
From:   Will Deacon <will@...nel.org>
To:     catalin.marinas@....com, linux-arm-kernel@...ts.infradead.org,
        He Zhe <zhe.he@...driver.com>, jolsa@...hat.com,
        alexander.shishkin@...ux.intel.com, linux-kernel@...r.kernel.org,
        mark.rutland@....com, namhyung@...nel.org
Cc:     kernel-team@...roid.com, Will Deacon <will@...nel.org>
Subject: Re: [PATCH 1/2] arm64: uprobe: Return EOPNOTSUPP for AARCH32 instruction probing

On Tue, 23 Feb 2021 16:25:34 +0800, He Zhe wrote:
> As stated in linux/errno.h, ENOTSUPP should never be seen by user programs.
> When we set up uprobe with 32-bit perf and arm64 kernel, we would see the
> following vague error without useful hint.
> 
> The sys_perf_event_open() syscall returned with 524 (INTERNAL ERROR:
> strerror_r(524, [buf], 128)=22)
> 
> [...]

Applied first patch only to arm64 (for-next/fixes), thanks!

[1/2] arm64: uprobe: Return EOPNOTSUPP for AARCH32 instruction probing
      https://git.kernel.org/arm64/c/d47422d953e2

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev