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Message-ID: <404e94ca-36b3-8ea2-8ccc-e4a261b38416@gmx.de> Date: Thu, 14 Sep 2017 10:39:03 +0200 From: Helge Deller <deller@....de> To: Sergey Senozhatsky <sergey.senozhatsky.work@...il.com> Cc: "Luck, Tony" <tony.luck@...el.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Sergey Senozhatsky <sergey.senozhatsky@...il.com>, Petr Mladek <pmladek@...e.com>, Andrew Morton <akpm@...ux-foundation.org>, "Yu, Fenghua" <fenghua.yu@...el.com>, Benjamin Herrenschmidt <benh@...nel.crashing.org>, Paul Mackerras <paulus@...ba.org>, Michael Ellerman <mpe@...erman.id.au> Subject: Re: [PATCH 00/14] Fix wrong %pF and %pS printk format specifier usages On 14.09.2017 10:03, Sergey Senozhatsky wrote: > On (09/14/17 16:40), Sergey Senozhatsky wrote: > [..] >> powerpc and parisc handle kernel .opd section as well: >> >> arch/powerpc/kernel/vmlinux.lds.S: .opd >> arch/parisc/kernel/vmlinux.lds.S: .opd > > for modules, arch-s define mod_arch_specific struct. > > parisc has .opd > > (fdesc offset should be the start of .opd, > fdesc_offset + sizeof(fdesc) * fdesc_count should be the .opd address range) > > struct mod_arch_specific > { > unsigned long got_offset, got_count, got_max; > unsigned long fdesc_offset, fdesc_count, fdesc_max; > struct { > unsigned long stub_offset; > unsigned int stub_entries; > } *section; > int unwind_section; > struct unwind_table *unwind; > }; > > > ia64 has .opd > > struct mod_arch_specific { > struct elf64_shdr *core_plt; /* core PLT section */ > struct elf64_shdr *init_plt; /* init PLT section */ > struct elf64_shdr *got; /* global offset table */ > struct elf64_shdr *opd; /* official procedure descriptors */ > struct elf64_shdr *unwind; /* unwind-table section */ > unsigned long gp; /* global-pointer for module */ > > void *core_unw_table; /* core unwind-table cookie returned by unwinder */ > void *init_unw_table; /* init unwind-table cookie returned by unwinder */ > unsigned int next_got_entry; /* index of next available got entry */ > }; > > > powerpc does not keep track of .opd, need to add > > struct mod_arch_specific { > #ifdef __powerpc64__ > unsigned int stubs_section; /* Index of stubs section in module */ > unsigned int toc_section; /* What section is the TOC? */ > bool toc_fixed; /* Have we fixed up .TOC.? */ > #ifdef CONFIG_DYNAMIC_FTRACE > unsigned long toc; > unsigned long tramp; > #endif > > #else /* powerpc64 */ > /* Indices of PLT sections within module. */ > unsigned int core_plt_section; > unsigned int init_plt_section; > #ifdef CONFIG_DYNAMIC_FTRACE > unsigned long tramp; > #endif > #endif /* powerpc64 */ > > /* List of BUG addresses, source line numbers and filenames */ > struct list_head bug_list; > struct bug_entry *bug_table; > unsigned int num_bugs; > }; > > > seems like we are looking at a solution here. > > thoughts? The basic concept of your proposal may work, and since it will avoid such coding issues in the future I think it's probably the best solution. Will you come up with a patch ? (I won't have time the next few days). If yes,I'd be happy to test it on parisc. Helge
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