Date: Thu, 3 Dec 2020 10:47:48 -0800 From: Sami Tolvanen <samitolvanen@...gle.com> To: Masahiro Yamada <masahiroy@...nel.org> Cc: Kees Cook <keescook@...omium.org>, Steven Rostedt <rostedt@...dmis.org>, Will Deacon <will@...nel.org>, Peter Zijlstra <peterz@...radead.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, "Paul E. McKenney" <paulmck@...nel.org>, Nick Desaulniers <ndesaulniers@...gle.com>, clang-built-linux <clang-built-linux@...glegroups.com>, Kernel Hardening <kernel-hardening@...ts.openwall.com>, linux-arch <linux-arch@...r.kernel.org>, linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>, Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, PCI <linux-pci@...r.kernel.org>, X86 ML <x86@...nel.org> Subject: Re: [PATCH v6 14/25] kbuild: lto: remove duplicate dependencies from .mod files On Thu, Dec 3, 2020 at 10:00 AM Masahiro Yamada <masahiroy@...nel.org> wrote: > > On Thu, Oct 15, 2020 at 7:50 AM Kees Cook <keescook@...omium.org> wrote: > > > > On Mon, Oct 12, 2020 at 05:31:52PM -0700, Sami Tolvanen wrote: > > > With LTO, llvm-nm prints out symbols for each archive member > > > separately, which results in a lot of duplicate dependencies in the > > > .mod file when CONFIG_TRIM_UNUSED_SYMS is enabled. When a module > > > consists of several compilation units, the output can exceed the > > > default xargs command size limit and split the dependency list to > > > multiple lines, which results in used symbols getting trimmed. > > > > > > This change removes duplicate dependencies, which will reduce the > > > probability of this happening and makes .mod files smaller and > > > easier to read. > > > > > > Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com> > > > Reviewed-by: Kees Cook <keescook@...omium.org> > > > > Hi Masahiro, > > > > This appears to be a general improvement as well. This looks like it can > > land without depending on the rest of the series. > > It cannot. > Adding "sort -u" is pointless without the rest of the series > since the symbol duplication happens only with Clang LTO. > > This is not a solution. > "reduce the probability of this happening" well describes it. > > I wrote a different patch. Great, thanks for looking into this. I'll drop this patch from the next version. Sami
Powered by blists - more mailing lists
Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.