module: replace module_layout with module_memory
module_layout manages different types of memory (text, data, rodata, etc.)
in one allocation, which is problematic for some reasons:
1. It is hard to enable CONFIG_STRICT_MODULE_RWX.
2. It is hard to use huge pages in modules (and not break strict rwx).
3. Many archs uses module_layout for arch-specific data, but it is not
obvious how these data are used (are they RO, RX, or RW?)
Improve the scenario by replacing 2 (or 3) module_layout per module with
up to 7 module_memory per module:
MOD_MEM_TYPE_TEXT,
MOD_MEM_TYPE_DATA,
MOD_MEM_TYPE_RODATA,
MOD_MEM_TYPE_RO_AFTER_INIT,
MOD_MEM_TYPE_INIT_TEXT,
MOD_MEM_TYPE_INIT_DATA,
MOD_MEM_TYPE_INIT_RODATA,
and allocating them separately.
Various archs use module_layout for different data. These data are put
into different module_memory based on their location in module_layout.
IOW, data that used to go with text is allocated with MOD_MEM_TYPE_TEXT;
data that used to go with data is allocated with MOD_MEM_TYPE_DATA, etc.
Signed-off-by: Song Liu <song@kernel.org>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
---
This is the preparation work for the type aware module_alloc() discussed
in [1]. While this work is not covered much in the discussion, it is a
critical step of the effort.
As this part grows pretty big (~1000 lines, + and -), I would like get
some feedback on it, so that I know it is on the right track.
Please share your comments. Thanks!
Test coverage: Tested on x86_64.
Build tested by kernel test bot in [2]. The only regression in [2] was a
typo in parisc, which is also fixed.
[1] https://lore.kernel.org/linux-mm/20221107223921.3451913-1-song@kernel.org/T/#u
[2] https://lore.kernel.org/linux-raid/63b8827e.clJQX2wg+I+tiX7m%25lkp@intel.com/T/#u
17 files changed
