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From: Nick Desaulniers <ndesaulniers@google.com>
To: Sami Tolvanen <samitolvanen@google.com>
Cc: Masahiro Yamada <masahiroy@kernel.org>,
	Will Deacon <will@kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	"Paul E. McKenney" <paulmck@kernel.org>,
	Kees Cook <keescook@chromium.org>,
	clang-built-linux <clang-built-linux@googlegroups.com>,
	Kernel Hardening <kernel-hardening@lists.openwall.com>,
	linux-arch <linux-arch@vger.kernel.org>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>,
	Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	linux-pci@vger.kernel.org,
	"maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)"
	<x86@kernel.org>, Bill Wendling <morbo@google.com>
Subject: Re: [PATCH 12/22] modpost: lto: strip .lto from module names
Date: Wed, 24 Jun 2020 15:05:26 -0700
Message-ID: <CAKwvOdkgXpxyV6UOpwh1O-_miu4O7pMDaSys=7BYg6jDZ-ox-A@mail.gmail.com> (raw)
In-Reply-To: <20200624203200.78870-13-samitolvanen@google.com>

On Wed, Jun 24, 2020 at 1:33 PM Sami Tolvanen <samitolvanen@google.com> wrote:
>
> With LTO, everything is compiled into LLVM bitcode, so we have to link
> each module into native code before modpost. Kbuild uses the .lto.o
> suffix for these files, which also ends up in module information. This
> change strips the unnecessary .lto suffix from the module name.
>
> Suggested-by: Bill Wendling <morbo@google.com>
> Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
> ---
>  scripts/mod/modpost.c    | 16 +++++++---------
>  scripts/mod/modpost.h    |  9 +++++++++
>  scripts/mod/sumversion.c |  6 +++++-
>  3 files changed, 21 insertions(+), 10 deletions(-)
>
> diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
> index 6aea65c65745..8352f8a1a138 100644
> --- a/scripts/mod/modpost.c
> +++ b/scripts/mod/modpost.c
> @@ -17,7 +17,6 @@
>  #include <ctype.h>
>  #include <string.h>
>  #include <limits.h>
> -#include <stdbool.h>

It looks like `bool` is used in the function signatures of other
functions in this TU, I'm not the biggest fan of hoisting the includes
out of the .c source into the header (I'd keep it in both), but I
don't feel strongly enough to NACK.

Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>

>  #include <errno.h>
>  #include "modpost.h"
>  #include "../../include/linux/license.h"
> @@ -80,14 +79,6 @@ modpost_log(enum loglevel loglevel, const char *fmt, ...)
>                 exit(1);
>  }
>
> -static inline bool strends(const char *str, const char *postfix)
> -{
> -       if (strlen(str) < strlen(postfix))
> -               return false;
> -
> -       return strcmp(str + strlen(str) - strlen(postfix), postfix) == 0;
> -}
> -
>  void *do_nofail(void *ptr, const char *expr)
>  {
>         if (!ptr)
> @@ -1975,6 +1966,10 @@ static char *remove_dot(char *s)
>                 size_t m = strspn(s + n + 1, "0123456789");
>                 if (m && (s[n + m] == '.' || s[n + m] == 0))
>                         s[n] = 0;
> +
> +               /* strip trailing .lto */
> +               if (strends(s, ".lto"))
> +                       s[strlen(s) - 4] = '\0';
>         }
>         return s;
>  }
> @@ -1998,6 +1993,9 @@ static void read_symbols(const char *modname)
>                 /* strip trailing .o */
>                 tmp = NOFAIL(strdup(modname));
>                 tmp[strlen(tmp) - 2] = '\0';
> +               /* strip trailing .lto */
> +               if (strends(tmp, ".lto"))
> +                       tmp[strlen(tmp) - 4] = '\0';
>                 mod = new_module(tmp);
>                 free(tmp);
>         }
> diff --git a/scripts/mod/modpost.h b/scripts/mod/modpost.h
> index 3aa052722233..fab30d201f9e 100644
> --- a/scripts/mod/modpost.h
> +++ b/scripts/mod/modpost.h
> @@ -2,6 +2,7 @@
>  #include <stdio.h>
>  #include <stdlib.h>
>  #include <stdarg.h>
> +#include <stdbool.h>
>  #include <string.h>
>  #include <sys/types.h>
>  #include <sys/stat.h>
> @@ -180,6 +181,14 @@ static inline unsigned int get_secindex(const struct elf_info *info,
>         return info->symtab_shndx_start[sym - info->symtab_start];
>  }
>
> +static inline bool strends(const char *str, const char *postfix)
> +{
> +       if (strlen(str) < strlen(postfix))
> +               return false;
> +
> +       return strcmp(str + strlen(str) - strlen(postfix), postfix) == 0;
> +}
> +
>  /* file2alias.c */
>  extern unsigned int cross_build;
>  void handle_moddevtable(struct module *mod, struct elf_info *info,
> diff --git a/scripts/mod/sumversion.c b/scripts/mod/sumversion.c
> index d587f40f1117..760e6baa7eda 100644
> --- a/scripts/mod/sumversion.c
> +++ b/scripts/mod/sumversion.c
> @@ -391,10 +391,14 @@ void get_src_version(const char *modname, char sum[], unsigned sumlen)
>         struct md4_ctx md;
>         char *fname;
>         char filelist[PATH_MAX + 1];
> +       int postfix_len = 1;
> +
> +       if (strends(modname, ".lto.o"))
> +               postfix_len = 5;
>
>         /* objects for a module are listed in the first line of *.mod file. */
>         snprintf(filelist, sizeof(filelist), "%.*smod",
> -                (int)strlen(modname) - 1, modname);
> +                (int)strlen(modname) - postfix_len, modname);
>
>         buf = read_text_file(filelist);
>
> --
> 2.27.0.212.ge8ba1cc988-goog
>


-- 
Thanks,
~Nick Desaulniers

  reply index

Thread overview: 118+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-24 20:31 [PATCH 00/22] add support for Clang LTO Sami Tolvanen
2020-06-24 20:31 ` [PATCH 01/22] objtool: use sh_info to find the base for .rela sections Sami Tolvanen
2020-06-24 20:31 ` [PATCH 02/22] kbuild: add support for Clang LTO Sami Tolvanen
2020-06-24 20:53   ` Nick Desaulniers
2020-06-24 21:29     ` Sami Tolvanen
2020-06-25  2:26   ` Nathan Chancellor
2020-06-25 16:13     ` Sami Tolvanen
2020-06-24 20:31 ` [PATCH 03/22] kbuild: lto: fix module versioning Sami Tolvanen
2020-06-24 20:31 ` [PATCH 04/22] kbuild: lto: fix recordmcount Sami Tolvanen
2020-06-24 21:27   ` Peter Zijlstra
2020-06-24 21:45     ` Sami Tolvanen
2020-06-25  7:45       ` Peter Zijlstra
2020-06-25 16:15         ` Sami Tolvanen
2020-06-25 20:02           ` [RFC][PATCH] objtool,x86_64: Replace recordmcount with objtool Peter Zijlstra
2020-06-25 20:54             ` Nick Desaulniers
2020-06-25 22:40             ` Sami Tolvanen
2020-06-26 11:29               ` Peter Zijlstra
2020-06-26 11:42                 ` Peter Zijlstra
2020-07-17 17:28                 ` Sami Tolvanen
2020-07-17 17:36                   ` Steven Rostedt
2020-07-17 17:47                     ` Sami Tolvanen
2020-07-17 18:05                       ` Steven Rostedt
2020-07-20 16:52                         ` Sami Tolvanen
2020-07-22 17:58                           ` Steven Rostedt
2020-07-22 18:07                             ` Sami Tolvanen
2020-07-22 17:55                 ` Steven Rostedt
2020-07-22 18:41                   ` Peter Zijlstra
2020-07-22 19:09                     ` Steven Rostedt
2020-07-22 20:03                       ` Sami Tolvanen
2020-07-22 23:56                       ` Peter Zijlstra
2020-07-23  0:06                         ` Steven Rostedt
2020-08-06 22:09                           ` Sami Tolvanen
2020-06-24 20:31 ` [PATCH 05/22] kbuild: lto: postpone objtool Sami Tolvanen
2020-06-24 21:19   ` Peter Zijlstra
2020-06-24 21:49     ` Sami Tolvanen
2020-06-25  7:47       ` Peter Zijlstra
2020-06-25 16:22         ` Sami Tolvanen
2020-06-25 18:33           ` Peter Zijlstra
2020-06-25 19:32             ` Sami Tolvanen
2020-06-24 20:31 ` [PATCH 06/22] kbuild: lto: limit inlining Sami Tolvanen
2020-06-24 21:20   ` Peter Zijlstra
2020-06-24 23:37     ` Sami Tolvanen
2020-06-24 20:31 ` [PATCH 07/22] kbuild: lto: merge module sections Sami Tolvanen
2020-06-24 21:01   ` Nick Desaulniers
2020-06-24 21:31     ` Sami Tolvanen
2020-06-24 20:31 ` [PATCH 08/22] kbuild: lto: remove duplicate dependencies from .mod files Sami Tolvanen
2020-06-24 21:13   ` Nick Desaulniers
2020-06-24 20:31 ` [PATCH 09/22] init: lto: ensure initcall ordering Sami Tolvanen
2020-06-24 20:31 ` [PATCH 10/22] init: lto: fix PREL32 relocations Sami Tolvanen
2020-06-24 20:31 ` [PATCH 11/22] pci: " Sami Tolvanen
2020-07-17 20:26   ` Bjorn Helgaas
2020-07-22 18:15     ` Sami Tolvanen
2020-06-24 20:31 ` [PATCH 12/22] modpost: lto: strip .lto from module names Sami Tolvanen
2020-06-24 22:05   ` Nick Desaulniers [this message]
2020-06-24 20:31 ` [PATCH 13/22] scripts/mod: disable LTO for empty.c Sami Tolvanen
2020-06-24 20:57   ` Nick Desaulniers
2020-06-24 20:31 ` [PATCH 14/22] efi/libstub: disable LTO Sami Tolvanen
2020-06-24 20:31 ` [PATCH 15/22] drivers/misc/lkdtm: disable LTO for rodata.o Sami Tolvanen
2020-06-24 20:31 ` [PATCH 16/22] arm64: export CC_USING_PATCHABLE_FUNCTION_ENTRY Sami Tolvanen
2020-06-24 20:31 ` [PATCH 17/22] arm64: vdso: disable LTO Sami Tolvanen
2020-06-24 20:58   ` Nick Desaulniers
2020-06-24 21:09     ` Nick Desaulniers
2020-06-24 23:51       ` Andi Kleen
2020-06-24 21:52     ` Sami Tolvanen
2020-06-24 23:05       ` Nick Desaulniers
2020-06-24 23:39         ` Sami Tolvanen
2020-06-24 20:31 ` [PATCH 18/22] arm64: allow LTO_CLANG and THINLTO to be selected Sami Tolvanen
2020-06-24 20:31 ` [PATCH 19/22] x86, vdso: disable LTO only for vDSO Sami Tolvanen
2020-06-24 20:31 ` [PATCH 20/22] x86, ftrace: disable recordmcount for ftrace_make_nop Sami Tolvanen
2020-06-24 20:31 ` [PATCH 21/22] x86, relocs: Ignore L4_PAGE_OFFSET relocations Sami Tolvanen
2020-06-24 20:32 ` [PATCH 22/22] x86, build: allow LTO_CLANG and THINLTO to be selected Sami Tolvanen
2020-06-24 21:15 ` [PATCH 00/22] add support for Clang LTO Peter Zijlstra
2020-06-24 21:30   ` Sami Tolvanen
2020-06-25  8:27     ` Will Deacon
2020-06-24 21:31   ` Nick Desaulniers
2020-06-25  8:03     ` Peter Zijlstra
2020-06-25  8:24       ` Peter Zijlstra
2020-06-25  8:57         ` Peter Zijlstra
2020-06-30 19:19           ` Marco Elver
2020-06-30 20:12             ` Peter Zijlstra
2020-06-30 20:30               ` Paul E. McKenney
2020-07-01  9:10                 ` Peter Zijlstra
2020-07-01 14:20                   ` David Laight
2020-07-01 16:06                     ` Paul E. McKenney
2020-07-02  9:37                       ` David Laight
2020-07-02 18:00                         ` Paul E. McKenney
2020-07-01  9:41                 ` Marco Elver
2020-07-01 10:03                   ` Will Deacon
2020-07-01 11:40                   ` Peter Zijlstra
2020-07-01 14:06                     ` Paul E. McKenney
2020-07-01 15:05                       ` Peter Zijlstra
2020-07-01 16:03                         ` Paul E. McKenney
2020-07-02  8:20                           ` Peter Zijlstra
2020-07-02 17:59                             ` Paul E. McKenney
2020-07-03 13:13                               ` Peter Zijlstra
2020-07-03 13:25                                 ` Peter Zijlstra
2020-07-03 14:51                                   ` Paul E. McKenney
2020-07-03 14:42                                 ` Paul E. McKenney
2020-07-06 16:26                                   ` Paul E. McKenney
2020-07-06 18:29                                     ` Peter Zijlstra
2020-07-06 18:39                                       ` Paul E. McKenney
2020-07-06 19:40                                         ` Peter Zijlstra
2020-07-06 23:41                                           ` Paul E. McKenney
2020-06-28 16:56 ` Masahiro Yamada
2020-06-29 23:20   ` Sami Tolvanen
2020-07-07 15:51     ` Sami Tolvanen
2020-07-07 16:05       ` Sami Tolvanen
2020-07-07 16:56         ` Jakub Kicinski
2020-07-07 17:17           ` Nick Desaulniers
2020-07-07 17:30             ` Jakub Kicinski
2020-07-11 16:32 ` Paul Menzel
2020-07-12  8:59   ` Sedat Dilek
2020-07-12 18:40     ` Nathan Chancellor
2020-07-14  9:44       ` Sedat Dilek
2020-07-14 17:54         ` Nick Desaulniers
2020-07-12 23:34   ` Sami Tolvanen
2020-07-14 12:16     ` Paul Menzel
2020-07-14 12:35       ` Sedat Dilek

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