linux-kernel - Re: [PATCH v2 00/33] locking/atomic: convert all architectures to ARCH

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Date:   Wed, 26 May 2021 13:30:11 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Mark Rutland <mark.rutland@....com>
Cc:     linux-kernel@...r.kernel.org, will@...nel.org,
        boqun.feng@...il.com, aou@...s.berkeley.edu, arnd@...db.de,
        bcain@...eaurora.org, benh@...nel.crashing.org, chris@...kel.net,
        dalias@...c.org, davem@...emloft.net, deanbo422@...il.com,
        deller@....de, geert@...ux-m68k.org, gerg@...ux-m68k.org,
        green.hu@...il.com, guoren@...nel.org, ink@...assic.park.msu.ru,
        James.Bottomley@...senpartnership.com, jcmvbkbc@...il.com,
        jonas@...thpole.se, ley.foon.tan@...el.com, linux@...linux.org.uk,
        mattst88@...il.com, monstr@...str.eu, mpe@...erman.id.au,
        nickhu@...estech.com, palmerdabbelt@...gle.com, paulus@...ba.org,
        paul.walmsley@...ive.com, rth@...ddle.net, shorne@...il.com,
        stefan.kristiansson@...nalahti.fi, tsbogend@...ha.franken.de,
        vgupta@...opsys.com, ysato@...rs.sourceforge.jp, junio@...ox.com
Subject: Re: [PATCH v2 00/33] locking/atomic: convert all architectures to
 ARCH_ATOMIC

On Tue, May 25, 2021 at 03:01:59PM +0100, Mark Rutland wrote:
> This series (based on v5.13-rc2) converts all architectures to
> ARCH_ATOMIC. This will allow the use of instrumented atomics on all
> architectures (e.g. for KASAN and similar), and simplifies the core
> atomic code (which should allow for easier rework of the fallbacks and
> other bits in future).
> 
> I'm hoping that we can queue this via the tip tree for v5.14.
> 
> I've build-tested this with the kernel.org crosstool GCC 10.3.0 binaries
> (all arches except hexagon), and I haven't seen issues with the configs
> I tried, so I'm fairly confident this is solid now. I'd like to get this
> into linux-next ASAP to flush out any remaining issues.
> 
> The series is split into three parts:
> 
> 1) Some preparatory work is done to prepare architectures and common
>    code for the conversion. In this phase h8300 and microblaze are
>    converted to use the asm-generic atomics exclusively, and the
>    asm-generic implementations are made to function with or without
>    ARCH_ATOMIC.
> 
> 2) Architectures are converted one-by-one to use the ARCH_ATOMIC
>    interface. I've converted each architecture with its own patch (even
>    where the conversion is trivial) to make review and bisection easier.
> 
> 3) The code handling !ARCH_ATOMIC is removed.
> 
> Note: I've generated the patches with:
> 
>   git format-patch -C -M -D
> 
> ... so the preimage of include/linux/atomic-fallback.h is not included
> in the diff when it is deleted.

So because I need the Link tag and things, I had to use b4 (or my own
scripts) and git-am, but that's incapable of digesting these patches.

I strongly feel that git-apply must be able to accept anything
git-format-patch generates, so I fixed it, see below.

With that; I could do:

  $ b4 am -slo - 20210525140232.53872-1-mark.rutland@....com | git am -D


Junio; can we get something like the below sorted?

---
diff --git a/apply.c b/apply.c
index 853d3ed385a6..20c3c8c5eddd 100644
--- a/apply.c
+++ b/apply.c
@@ -3650,7 +3650,7 @@ static int apply_data(struct apply_state *state, struct patch *patch,
 	add_to_fn_table(state, patch);
 	free(image.line_allocated);
 
-	if (0 < patch->is_delete && patch->resultsize)
+	if (0 < patch->is_delete && patch->resultsize && !state->force_delete)
 		return error(_("removal patch leaves file contents"));
 
 	return 0;
@@ -5059,6 +5059,7 @@ int apply_parse_options(int argc, const char **argv,
 		OPT_CALLBACK(0, "directory", state, N_("root"),
 			N_("prepend <root> to all filenames"),
 			apply_option_parse_directory),
+		OPT_BOOL('D', "irreversible-delete", &state->force_delete, N_("DWIW")),
 		OPT_END()
 	};
 
diff --git a/apply.h b/apply.h
index da3d95fa5098..73819110387b 100644
--- a/apply.h
+++ b/apply.h
@@ -66,6 +66,7 @@ struct apply_state {
 	int threeway;
 	int unidiff_zero;
 	int unsafe_paths;
+	int force_delete;
 
 	/* Other non boolean parameters */
 	struct repository *repo;
diff --git a/builtin/am.c b/builtin/am.c
index 0b2d886c81b7..4776a42d5312 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -2323,6 +2323,9 @@ int cmd_am(int argc, const char **argv, const char *prefix)
 		OPT_PASSTHRU_ARGV(0, "reject", &state.git_apply_opts, NULL,
 			N_("pass it through git-apply"),
 			PARSE_OPT_NOARG),
+		OPT_PASSTHRU_ARGV('D', "irreversible-delete", &state.git_apply_opts, NULL,
+			N_("pass it through git-apply"),
+			PARSE_OPT_NOARG),
 		OPT_STRING(0, "resolvemsg", &state.resolvemsg, NULL,
 			N_("override error message when patch failure occurs")),
 		OPT_CMDMODE(0, "continue", &resume.mode,