From: Al Viro <viro@zeniv.linux.org.uk>
To: Andy Shevchenko <andy@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>,
tanzirh@google.com, Kees Cook <keescook@chromium.org>,
linux-hardening@vger.kernel.org, linux-kernel@vger.kernel.org,
Nick DeSaulniers <nnn@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
llvm@lists.linux.dev
Subject: Re: [PATCH] lib/string: shrink lib/string.i via IWYU
Date: Tue, 5 Dec 2023 22:32:05 +0000 [thread overview]
Message-ID: <20231205223205.GI1674809@ZenIV> (raw)
In-Reply-To: <20231205221521.GH1674809@ZenIV>
On Tue, Dec 05, 2023 at 10:15:21PM +0000, Al Viro wrote:
> It would certainly be nice to have such information in the tree;
> "where should I pick $SYMBOL from?" is something one needs to
> find out often enough. To a large extent it's covered by "where
> in include/*.h do we have it defined?", but that's not all there
> is to it. E.g. "get_user() => use linux/uaccess.h".
>
> There's also stuff like "$SYMBOL should not be used outside of arch/*
> and include/*, better use $OTHER_SYMBOL", etc.
Speaking of...
arch/arm64/include/asm/asm-prototypes.h:18:#include <asm/uaccess.h>
arch/powerpc/include/asm/inst.h:8:#include <asm/uaccess.h>
arch/powerpc/kvm/book3s_xive_native.c:16:#include <asm/uaccess.h>
arch/powerpc/mm/book3s64/radix_pgtable.c:31:#include <asm/uaccess.h>
arch/riscv/kernel/sys_riscv.c:15:#include <asm/uaccess.h>
arch/xtensa/include/asm/asm-prototypes.h:10:#include <asm/uaccess.h>
include/linux/uaccess.h:11:#include <asm/uaccess.h>
tools/testing/crypto/chacha20-s390/test-cipher.c:8:#include <asm/uaccess.h>
Only one of those is legitimate (linux/uaccess.h); asm-prototypes.h
ones are borderline, but probably should be pulling linux/uaccess.h,
everything in *.c is really wrong. Powerpc asm/inst.h is the really
unpleasant one here - it's pulled by quite a few other places, including
several asm/*.h. Hell knows; might be worth splitting the
{__,}{get_user_instr,copy_inst_from_kernel_nofault}() off to
a separate header (asm/inst-uaccess.h?), to be included only by the
files that use any of those (that would be
arch/powerpc/kernel/{align,hw_breakpoint_constraints,module_32,traps,vecemu}.c
and arch/powerpc/kernel/trace/{ftrace,ftrace_64_pg}.c - not a single header
among them). That header would pull linux/uaccess.h and asm/inst.h wouldn't
need any uaccess at all; might spill into explicit includes of linux/uaccess.h
in some of the places in arch/powerpc that pull asm/inst.h, directly or
not...
next prev parent reply other threads:[~2023-12-05 22:32 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-05 20:58 [PATCH] lib/string: shrink lib/string.i via IWYU tanzirh
2023-12-05 21:04 ` Andrew Morton
2023-12-05 21:14 ` Nick Desaulniers
2023-12-05 21:24 ` Andrew Morton
2023-12-05 21:39 ` Nick Desaulniers
2023-12-05 21:43 ` Al Viro
2023-12-05 21:57 ` Nick Desaulniers
2023-12-11 20:47 ` Nick Desaulniers
2023-12-11 20:50 ` Andy Shevchenko
2023-12-05 21:53 ` Andy Shevchenko
2023-12-05 22:05 ` Nick Desaulniers
2023-12-07 6:25 ` Christoph Hellwig
2023-12-05 21:38 ` Al Viro
2023-12-05 21:51 ` Nick Desaulniers
2023-12-05 21:59 ` Greg KH
2023-12-05 22:14 ` Nick Desaulniers
2023-12-05 23:46 ` Greg KH
2023-12-06 0:55 ` Al Viro
2023-12-06 3:00 ` Al Viro
2023-12-06 3:09 ` Greg KH
2023-12-14 21:04 ` Al Viro
2023-12-15 21:03 ` Al Viro
2023-12-07 12:50 ` Andy Shevchenko
2023-12-05 22:01 ` Andy Shevchenko
2023-12-05 22:10 ` Randy Dunlap
2023-12-05 22:25 ` Nick Desaulniers
2023-12-05 22:15 ` Al Viro
2023-12-05 22:20 ` Nick Desaulniers
2023-12-05 22:32 ` Al Viro [this message]
2023-12-07 12:52 ` Andy Shevchenko
2023-12-05 21:57 ` Al Viro
2023-12-05 21:50 ` Andy Shevchenko
2023-12-05 22:05 ` Andy Shevchenko
2023-12-06 7:10 ` kernel test robot
2023-12-07 12:55 ` Andy Shevchenko
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