linux-kernel - Re: [PATCH 5/5] lib/nodemask: inline next_node_in() and node

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Message-ID: <20220729034638.GA2276915@roeck-us.net>
Date:   Thu, 28 Jul 2022 20:46:38 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Yury Norov <yury.norov@...il.com>
Cc:     linux-kernel@...r.kernel.org,
        Alexander Lobakin <alexandr.lobakin@...el.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Arnd Bergmann <arnd@...db.de>, David Gow <davidgow@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Isabella Basso <isabbasso@...eup.net>,
        Kees Cook <keescook@...omium.org>,
        Keith Busch <kbusch@...nel.org>,
        Kumar Kartikeya Dwivedi <memxor@...il.com>,
        Marco Elver <elver@...gle.com>,
        Mark Rutland <mark.rutland@....com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Steven Rostedt <rostedt@...dmis.org>,
        Toke Høiland-Jørgensen <toke@...hat.com>
Subject: Re: [PATCH 5/5] lib/nodemask: inline next_node_in() and node_random()

On Sun, Jul 10, 2022 at 09:47:11PM -0700, Yury Norov wrote:
> The functions are pretty thin wrappers around find_bit engine, and
> keeping them in c-file prevents compiler from small_const_nbits()
> optimization, which must take place for all systems with MAX_NUMNODES
> less than BITS_PER_LONG (default is 16 for me).
> 
> Moving them in header file doesn't blow up the kernel size:
> add/remove: 1/2 grow/shrink: 9/5 up/down: 968/-88 (880)
> 
> Signed-off-by: Yury Norov <yury.norov@...il.com>

This patch results in

Building powerpc:allmodconfig ... failed
--------------
Error log:
In file included from include/linux/nodemask.h:97,
                 from include/linux/sched.h:22,
                 from include/linux/sched/mm.h:7,
                 from arch/powerpc/lib/feature-fixups.c:16:
include/linux/random.h: In function 'add_latent_entropy':
include/linux/random.h:25:46: error: 'latent_entropy' undeclared

and many more similar errors when trying to compile ppc:allmodconfig.

Guenter

---
# bad: [7c5e07b73ff3011c9b82d4a3286a3362b951ad2b] Add linux-next specific files for 20220728
# good: [e0dccc3b76fb35bb257b4118367a883073d7390e] Linux 5.19-rc8
git bisect start 'HEAD' 'v5.19-rc8'
# good: [96bce6a87ad9690eaa9b1ca9ace7c98444d7869f] Revert "Revert "drm/amdgpu: add drm buddy support to amdgpu""
git bisect good 96bce6a87ad9690eaa9b1ca9ace7c98444d7869f
# good: [6826ff5991a129f39064118771333e494e866056] Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git
git bisect good 6826ff5991a129f39064118771333e494e866056
# good: [df0b60ba0ccf758c3db940b965c019fc1d3e653a] Merge branch 'char-misc-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git
git bisect good df0b60ba0ccf758c3db940b965c019fc1d3e653a
# good: [eb8489c7931473c1d1c2a122ac84317ba2c6cff6] Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/livepatching/livepatching
git bisect good eb8489c7931473c1d1c2a122ac84317ba2c6cff6
# good: [4724a9771b17c1fb2409c2b50d9bf9ae65262d9a] Merge branch 'mm-nonmm-unstable' into mm-everything
git bisect good 4724a9771b17c1fb2409c2b50d9bf9ae65262d9a
# good: [50186f0b6f5020051f58b5b865a0abc97483700a] Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl.git
git bisect good 50186f0b6f5020051f58b5b865a0abc97483700a
# good: [03b33c09ea22fa89dd204ad0a2058e512c691b9f] fs: remove the NULL get_block case in mpage_writepages
git bisect good 03b33c09ea22fa89dd204ad0a2058e512c691b9f
# good: [c28fab17145d04eceac245c4839e65582b4d3083] Merge branch 'rust-next' of https://github.com/Rust-for-Linux/linux.git
git bisect good c28fab17145d04eceac245c4839e65582b4d3083
# bad: [9f0b715d001153c4002b39f2e1acdf9183e3735b] lib/nodemask: inline next_node_in() and node_random()
git bisect bad 9f0b715d001153c4002b39f2e1acdf9183e3735b
# good: [b0b0b77ea611e3088e9523e60860f4f41b62b235] iommu/vt-d: avoid invalid memory access via node_online(NUMA_NO_NODE)
git bisect good b0b0b77ea611e3088e9523e60860f4f41b62b235
# good: [9b2e70860ef2f0d74b6d9e57929d57b14481b9c9] lib/cpumask: move trivial wrappers around find_bit to the header
git bisect good 9b2e70860ef2f0d74b6d9e57929d57b14481b9c9
# good: [7343f2b0db4961d9f386e685e651c663dc763d0c] headers/deps: mm: align MANITAINERS and Docs with new gfp.h structure
git bisect good 7343f2b0db4961d9f386e685e651c663dc763d0c
# good: [3a2ba42cbd0b669ce3837ba400905f93dd06c79f] x86/olpc: fix 'logical not is only applied to the left hand side'
git bisect good 3a2ba42cbd0b669ce3837ba400905f93dd06c79f
# good: [c3aaaf9e2ada48c0e3d03203ca6458362a639c2c] powerpc: drop dependency on <asm/machdep.h> in archrandom.h
git bisect good c3aaaf9e2ada48c0e3d03203ca6458362a639c2c
# first bad commit: [9f0b715d001153c4002b39f2e1acdf9183e3735b] lib/nodemask: inline next_node_in() and node_random()