From: Andrew Morton <akpm@linux-foundation.org>
To: thnkslprpt@gmail.com, brads@mainlining.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/2] profile: account for partial /proc/profile reads
Date: Tue, 20 Oct 2026 17:51:37 -0700 [thread overview]
Message-ID: <20261020175137.c57485e7e7121d708effc68e@linux-foundation.org> (raw)
In-Reply-To: <feaa6c8de4df451f98efb7a337541321.1@linux-foundation.org>
On Tue, 20 Oct 2026 17:47:06 -0700 Andrew Morton <akpm@linux-foundation.org> wrote:
> read_profile() returns -EFAULT without advancing the file position
> when a user copy faults, even if earlier header bytes or a prefix of
> the counters were successfully copied. A retry can therefore copy
> the same bytes again despite the previous read having delivered data.
>
> Return the number of successfully copied bytes and advance *ppos by
> that amount. Return -EFAULT only if the fault occurs before any bytes
> are copied. Preserve the four-byte sampling-step header, raw counter
> representation, and normal successful-read behavior.
>
> Avi Weiss's "profiling: fix sampling step on 64-bit big-endian
> systems" is unchanged. This patch changes only short-read and
> fault reporting, not the output format.
Sashiko: "Failed To Apply".
bah. I'll resend all three.
prev parent reply other threads:[~2026-10-21 0:51 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-21 0:47 [PATCH 1/2] profile: account for partial /proc/profile reads Andrew Morton
2026-10-21 0:47 ` [PATCH 2/2] profile: simplify /proc/profile read layout Andrew Morton
2026-10-21 0:51 ` Andrew Morton [this message]
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