Changes in kernel/generic/src/proc/thread.c [38ff925:c0699467] in mainline

File:

• kernel/generic/src/proc/thread.c (modified) (1 diff)

kernel/generic/src/proc/thread.c

@@ -173 +173 @@
 #endif /* CONFIG_FPU */
         
-        /*
-         * Allocate the kernel stack from the low-memory to prevent an infinite
-         * nesting of TLB-misses when accessing the stack from the part of the
-         * TLB-miss handler written in C.
-         *
-         * Note that low-memory is safe to be used for the stack as it will be
-         * covered by the kernel identity mapping, which guarantees not to
-         * nest TLB-misses infinitely (either via some hardware mechanism or
-         * by the construciton of the assembly-language part of the TLB-miss
-         * handler).
-         *
-         * This restriction can be lifted once each architecture provides
-         * a similar guarantee, for example by locking the kernel stack
-         * in the TLB whenever it is allocated from the high-memory and the
-         * thread is being scheduled to run.
-         */
-        kmflags |= FRAME_LOWMEM;
-        kmflags &= ~FRAME_HIGHMEM;
-
         thread->kstack = (uint8_t *) frame_alloc(STACK_FRAMES, FRAME_KA | kmflags);
         if (!thread->kstack) {