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In some cases, the stack pointer on x86 (rsp = reg7) is used to point variables on stack but it's not the frame base register. Then it should handle the register like normal registers (IOW not to access the other stack variables using offset calculation) but it should not assume it would have a pointer. Before: ----------------------------------------------------------- find data type for 0x7c(reg7) at tcp_getsockopt+0xb62 CU for net/ipv4/tcp.c (die:0x7b5f516) frame base: cfa=0 fbreg=6 no pointer or no type check variable "zc" failed (die: 0x7b9580a) variable location: base=reg7, offset=0x40 type='struct tcp_zerocopy_receive' size=0x40 (die:0x7b947f4) After: ----------------------------------------------------------- find data type for 0x7c(reg7) at tcp_getsockopt+0xb62 CU for net/ipv4/tcp.c (die:0x7b5f516) frame base: cfa=0 fbreg=6 found "zc" in scope=3/3 (die: 0x7b957fc) type_offset=0x3c variable location: base=reg7, offset=0x40 type='struct tcp_zerocopy_receive' size=0x40 (die:0x7b947f4) Note that the type-offset was properly calculated to 0x3c as the variable starts at 0x40. Signed-off-by: Namhyung Kim <namhyung@kernel.org> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Ian Rogers <irogers@google.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Kan Liang <kan.liang@linux.intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Link: https://lore.kernel.org/r/20240412183310.2518474-5-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.