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f5afa2e8ef
So the temp_mm_state_t abstraction used by use_temporary_mm() and
unuse_temporary_mm() is super confusing:
- The whole machinery is about temporarily switching to the
text_poke_mm utility MM that got allocated during bootup
for text-patching purposes alone:
temp_mm_state_t prev;
/*
* Loading the temporary mm behaves as a compiler barrier, which
* guarantees that the PTE will be set at the time memcpy() is done.
*/
prev = use_temporary_mm(text_poke_mm);
- Yet the value that gets saved in the temp_mm_state_t variable
is not the temporary MM ... but the previous MM...
- Ie. we temporarily put the non-temporary MM into a variable
that has the temp_mm_state_t type. This makes no sense whatsoever.
- The confusion continues in unuse_temporary_mm():
static inline void unuse_temporary_mm(temp_mm_state_t prev_state)
Here we unuse an MM that is ... not the temporary MM, but the
previous MM. :-/
Fix up all this confusion by removing the unnecessary layer of
abstraction and using a bog-standard 'struct mm_struct *prev_mm'
variable to save the MM to.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Juergen Gross <jgross@suse.com>
Cc: "H . Peter Anvin" <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20250411054105.2341982-14-mingo@kernel.org
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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.