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Groups > linux.kernel > #1419529
| From | Jason Baron <jbaron@akamai.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH v2 4/4] dynamic_debug: add jump label support |
| Date | 2016-06-10 17:40 +0200 |
| Message-ID | <rIwHo-6kc-3@gated-at.bofh.it> (permalink) |
| References | <rAZZT-2CA-5@gated-at.bofh.it> <rAZZT-2CA-9@gated-at.bofh.it> <rIrol-2W0-13@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On 06/10/2016 05:54 AM, Arnd Bergmann wrote: > On Friday, May 20, 2016 5:16:36 PM CEST Jason Baron wrote: >> Although dynamic debug is often only used for debug builds, sometimes its >> enabled for production builds as well. Minimize its impact by using jump >> labels. This reduces the text section by 7000+ bytes in the kernel image >> below. It does increase data, but this should only be referenced when >> changing the direction of the branches, and hence usually not in cache. >> >> text data bss dec hex filename >> 8194852 4879776 925696 14000324 d5a0c4 vmlinux.pre >> 8187337 4960224 925696 14073257 d6bda9 vmlinux.post >> >> Signed-off-by: Jason Baron <jbaron@akamai.com> >> --- > > This causes problems for some of my randconfig builds, when a dynamic > debug call is used inside of an __exit function: > > `.exit.text' referenced in section `__jump_table' of drivers/built-in.o: defined in discarded section `.exit.text' of drivers/built-in.o > `.exit.text' referenced in section `__jump_table' of drivers/built-in.o: defined in discarded section `.exit.text' of drivers/built-in.o > > Arnd > Hi, I stuck pr_debug() in a few functions marked with __exit, but did not reproduce yet. Can you share your .config and gcc --version. Thanks, -Jason
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Re: [PATCH v2 4/4] dynamic_debug: add jump label support Arnd Bergmann <arnd@arndb.de> - 2016-06-10 12:00 +0200
Re: [PATCH v2 4/4] dynamic_debug: add jump label support Jason Baron <jbaron@akamai.com> - 2016-06-10 17:40 +0200
Re: [PATCH v2 4/4] dynamic_debug: add jump label support Arnd Bergmann <arnd@arndb.de> - 2016-06-13 18:10 +0200
Re: [PATCH v2 4/4] dynamic_debug: add jump label support Arnd Bergmann <arnd@arndb.de> - 2016-06-13 22:30 +0200
Re: [PATCH v2 4/4] dynamic_debug: add jump label support Jason Baron <jbaron@akamai.com> - 2016-06-13 22:40 +0200
Re: [PATCH v2 4/4] dynamic_debug: add jump label support Jason Baron <jbaron@akamai.com> - 2016-06-10 23:30 +0200
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